<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Demo2</title>
    <link rel="stylesheet" href="./Demo2.css">
</head>
<body>
    <p>Hello World</p>
    <p class="sleep">睡觉</p>
    <p id="sever">后端开发</p>
    <ol>
        <li>吃饭</li>
        <li>吃饭</li>
        <li>吃饭</li>
    </ol>
    <ul class="game">
        <li>玩游戏</li>
        <li>玩游戏</li>
        <li>玩游戏</li>
        <li>
            <a href="#">玩游戏</a>
        </li>
    </ul>
    <input type="button" id="button" value="按钮">
</body>
</html>